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1997-07-07
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GTEK BBS-550 with Linux mini-HOWTO
by Wajihuddin Ahmed <wahmed@sdnpk.undp.org>
v1.0, 20 November 1996
GTEK's BBS-550 is a 8-port serial card with 16C550 UARTS. Only one IRQ
can be used for all 8 ports. It does not require any driver on Linux
therefore the kernel does not have to be recompiled but the kernel should
have serial support.
============================================================================
1. What I/O addresses to use?
2. The rc.serial file and IRQ selection
3. Setup of uugetty
4. Final checking...
============================================================================
1. For detailed information of configuring serial ports on Linux refer
to the Serial-HOWTO. Thats where I started from.
I have setup the BBS-550 to use I/O address from 0x100 to 0x140 on my
Linux box (Slackware 2.3, kernel 1.3.93). The main reason being that the
above address space was vacant in my computer. Page 4 of the manual gives
the jumper settings. Also this range of I/O addresses is seldom used by
any other hardware. Just to make sure that this space is available on
your machine, use the IOMAP.EXE utility which is on the GTEK floppy disk.
2. After you have installed the card on your computer you need to configure
the serial ports. This is quite easy since the rc.serial file already
has entries for BOCA 8 port card which i used for the GTEK. Here is my
rc.serial file. Don't forget to execute it from the rc.S file by
uncommenting the line that executes it.
--
#!/bin/sh
#
# /etc/rc.serial
# Initializes the serial ports on your system
#
# Version 2.01
cd /dev
SETSERIAL="/bin/setserial -a"
PORTS=`echo cua? cua??`
echo -n "Configuring serial ports...."
# Do wild interrupt detection
#
#${SETSERIAL} -W ${PORTS}
# Do AUTOMATIC_IRQ probing
#
#AUTO_IRQ=auto_irq
${SETSERIAL} /dev/cua16 uart 16550A port 0x100 irq 5
${SETSERIAL} /dev/cua17 uart 16550A port 0x108 irq 5
${SETSERIAL} /dev/cua18 uart 16550A port 0x110 irq 5
${SETSERIAL} /dev/cua19 uart 16550A port 0x118 irq 5
${SETSERIAL} /dev/cua20 uart 16550A port 0x120 irq 5
#${SETSERIAL} /dev/cua21 uart 16550A port 0x128 irq 5
#${SETSERIAL} /dev/cua22 uart 16550A port 0x130 irq 5
#${SETSERIAL} /dev/cua23 uart 16550A port 0x138 irq 5
echo "done."
${SETSERIAL} -bg ${PORTS}
--
Notice that i have used IRQ 5. Refer to page 6 of the GTEK manual on
howto set the IRQ.
============================================================================
3. I am using uugetty for dial-in's. Here is an extract from my
/etc/inittab file (sys V).
s1:45:respawn:/sbin/uugetty ttyS16 38400 vt100
s2:45:respawn:/sbin/uugetty ttyS17 38400 vt100
s3:45:respawn:/sbin/uugetty ttyS18 38400 vt100
s4:45:respawn:/sbin/uugetty ttyS19 38400 vt100
s5:45:respawn:/sbin/uugetty ttyS20 57600 vt100
#s6:45:respawn:/sbin/uugetty ttyS21 38400 vt100
#s7:45:respawn:/sbin/uugetty ttyS22 38400 vt100
#s8:45:respawn:/sbin/uugetty ttyS23 38400 vt100
Make sure that you have the corresponding entries in the /etc/gettydefs file.
Also don't forget to make new uugetty configuration files in the /etc/default
directory.
============================================================================
4. At boot up the kernel will not report the new tty's.
The serial ports are configured when the rc.serial script is run. You
can see that on the screen during boot up.
'ps' should show the uugetty connected. Here is part of my ps output.
18208 ? S 0:00 /sbin/uugetty ttyS18 38400 vt100
18247 ? S 0:00 /sbin/uugetty ttyS20 57600 vt100
18254 ? S 0:00 /sbin/uugetty ttyS19 38400 vt100
18258 ? S 0:00 /sbin/uugetty ttyS17 38400 vt100
18260 ? S 0:00 /sbin/uugetty ttyS16 38400 vt100
Finally test the board by dialing out (using cuaXX) and then dialing
in (ttySXX).
Good Luck!